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849172ff48
Formerly, the value computed by leftmostvalue_interval() was a long way short of the minimum possible interval value. As a result, an index scan on a GIN index on an interval column with < or <= operators would miss large negative interval values. Fix by setting all fields of the leftmost interval to their minimum values, ensuring that the result is less than any other possible interval. Since this only affects index searches, no index rebuild is necessary. Back-patch to all supported branches. Dean Rasheed, reviewed by Heikki Linnakangas. Discussion: https://postgr.es/m/CAEZATCV80%2BgOfF8ehNUUfaKBZgZMDfCfL-g1HhWGb6kC3rpDfw%40mail.gmail.com
58 lines
1.4 KiB
Plaintext
58 lines
1.4 KiB
Plaintext
set enable_seqscan=off;
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CREATE TABLE test_interval (
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i interval
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);
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INSERT INTO test_interval VALUES
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( '-178000000 years' ),
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( '03:55:08' ),
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( '04:55:08' ),
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( '05:55:08' ),
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( '08:55:08' ),
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( '09:55:08' ),
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( '10:55:08' ),
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( '178000000 years' )
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;
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CREATE INDEX idx_interval ON test_interval USING gin (i);
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SELECT * FROM test_interval WHERE i<'08:55:08'::interval ORDER BY i;
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i
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--------------------------
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@ 178000000 years ago
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@ 3 hours 55 mins 8 secs
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@ 4 hours 55 mins 8 secs
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@ 5 hours 55 mins 8 secs
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(4 rows)
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SELECT * FROM test_interval WHERE i<='08:55:08'::interval ORDER BY i;
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i
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--------------------------
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@ 178000000 years ago
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@ 3 hours 55 mins 8 secs
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@ 4 hours 55 mins 8 secs
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@ 5 hours 55 mins 8 secs
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@ 8 hours 55 mins 8 secs
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(5 rows)
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SELECT * FROM test_interval WHERE i='08:55:08'::interval ORDER BY i;
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i
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--------------------------
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@ 8 hours 55 mins 8 secs
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(1 row)
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SELECT * FROM test_interval WHERE i>='08:55:08'::interval ORDER BY i;
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i
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---------------------------
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@ 8 hours 55 mins 8 secs
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@ 9 hours 55 mins 8 secs
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@ 10 hours 55 mins 8 secs
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@ 178000000 years
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(4 rows)
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SELECT * FROM test_interval WHERE i>'08:55:08'::interval ORDER BY i;
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i
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---------------------------
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@ 9 hours 55 mins 8 secs
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@ 10 hours 55 mins 8 secs
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@ 178000000 years
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(3 rows)
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